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<FONT color="green">001</FONT>    package edu.hawaii.myisern.action;<a name="line.1"></a>
<FONT color="green">002</FONT>    <a name="line.2"></a>
<FONT color="green">003</FONT>    import javax.servlet.Filter;<a name="line.3"></a>
<FONT color="green">004</FONT>    import javax.servlet.FilterChain;<a name="line.4"></a>
<FONT color="green">005</FONT>    import javax.servlet.FilterConfig;<a name="line.5"></a>
<FONT color="green">006</FONT>    import javax.servlet.ServletException;<a name="line.6"></a>
<FONT color="green">007</FONT>    import javax.servlet.ServletRequest;<a name="line.7"></a>
<FONT color="green">008</FONT>    import javax.servlet.ServletResponse;<a name="line.8"></a>
<FONT color="green">009</FONT>    import javax.servlet.http.HttpServletRequest;<a name="line.9"></a>
<FONT color="green">010</FONT>    import javax.servlet.http.HttpServletResponse;<a name="line.10"></a>
<FONT color="green">011</FONT>    import java.io.IOException;<a name="line.11"></a>
<FONT color="green">012</FONT>    import java.net.URLEncoder;<a name="line.12"></a>
<FONT color="green">013</FONT>    import java.util.HashSet;<a name="line.13"></a>
<FONT color="green">014</FONT>    import java.util.Set;<a name="line.14"></a>
<FONT color="green">015</FONT>    <a name="line.15"></a>
<FONT color="green">016</FONT>    /**<a name="line.16"></a>
<FONT color="green">017</FONT>     * A simplistic security filter for Bugzooky that ensures that the user is logged in<a name="line.17"></a>
<FONT color="green">018</FONT>     * before allowing access to any secured pages.<a name="line.18"></a>
<FONT color="green">019</FONT>     *<a name="line.19"></a>
<FONT color="green">020</FONT>     * @author Tim Fennell<a name="line.20"></a>
<FONT color="green">021</FONT>     */<a name="line.21"></a>
<FONT color="green">022</FONT>    public class SecurityFilter implements Filter {<a name="line.22"></a>
<FONT color="green">023</FONT>      private static Set&lt;String&gt; publicUrls = new HashSet&lt;String&gt;();<a name="line.23"></a>
<FONT color="green">024</FONT>    <a name="line.24"></a>
<FONT color="green">025</FONT>      static {<a name="line.25"></a>
<FONT color="green">026</FONT>          publicUrls.add("/index.jsp");<a name="line.26"></a>
<FONT color="green">027</FONT>          publicUrls.add("/Index.action");<a name="line.27"></a>
<FONT color="green">028</FONT>          publicUrls.add("/Login.action");<a name="line.28"></a>
<FONT color="green">029</FONT>          publicUrls.add("/Logout.action");<a name="line.29"></a>
<FONT color="green">030</FONT>          publicUrls.add("/default.css");<a name="line.30"></a>
<FONT color="green">031</FONT>      }<a name="line.31"></a>
<FONT color="green">032</FONT>      /** An error string, always displayed, but invisible if empty. */<a name="line.32"></a>
<FONT color="green">033</FONT>      private String errorMessage = "";<a name="line.33"></a>
<FONT color="green">034</FONT>      <a name="line.34"></a>
<FONT color="green">035</FONT>      /**<a name="line.35"></a>
<FONT color="green">036</FONT>       * Returns the error message, which may be empty.<a name="line.36"></a>
<FONT color="green">037</FONT>       * <a name="line.37"></a>
<FONT color="green">038</FONT>       * @return The error message. <a name="line.38"></a>
<FONT color="green">039</FONT>       */<a name="line.39"></a>
<FONT color="green">040</FONT>      public String getErrorMessage() {<a name="line.40"></a>
<FONT color="green">041</FONT>        return this.errorMessage;<a name="line.41"></a>
<FONT color="green">042</FONT>      }<a name="line.42"></a>
<FONT color="green">043</FONT>      <a name="line.43"></a>
<FONT color="green">044</FONT>      /**<a name="line.44"></a>
<FONT color="green">045</FONT>       * Set's the error message for the user.<a name="line.45"></a>
<FONT color="green">046</FONT>       * <a name="line.46"></a>
<FONT color="green">047</FONT>       * @param errorMessage The error message. <a name="line.47"></a>
<FONT color="green">048</FONT>       */<a name="line.48"></a>
<FONT color="green">049</FONT>      public void setErrorMessage(String errorMessage) {<a name="line.49"></a>
<FONT color="green">050</FONT>        this.errorMessage = errorMessage;<a name="line.50"></a>
<FONT color="green">051</FONT>      }<a name="line.51"></a>
<FONT color="green">052</FONT>    <a name="line.52"></a>
<FONT color="green">053</FONT>      /** <a name="line.53"></a>
<FONT color="green">054</FONT>       * Does nothing. <a name="line.54"></a>
<FONT color="green">055</FONT>       * @param filterConfig nothing.<a name="line.55"></a>
<FONT color="green">056</FONT>       * @throws ServletException another exception<a name="line.56"></a>
<FONT color="green">057</FONT>       */<a name="line.57"></a>
<FONT color="green">058</FONT>      public void init(FilterConfig filterConfig) throws ServletException { <a name="line.58"></a>
<FONT color="green">059</FONT>        // does nothing<a name="line.59"></a>
<FONT color="green">060</FONT>      }<a name="line.60"></a>
<FONT color="green">061</FONT>    <a name="line.61"></a>
<FONT color="green">062</FONT>      /** <a name="line.62"></a>
<FONT color="green">063</FONT>       * Checks to see if user is validated.  If the user successfully starts a<a name="line.63"></a>
<FONT color="green">064</FONT>       * session or the page trying to be accessed is a "public url," it will <a name="line.64"></a>
<FONT color="green">065</FONT>       * process the request.  If not successfull, it will redirect to the login page.<a name="line.65"></a>
<FONT color="green">066</FONT>       * @param servletRequest nothing.<a name="line.66"></a>
<FONT color="green">067</FONT>       * @param servletResponse nothing.<a name="line.67"></a>
<FONT color="green">068</FONT>       * @param filterChain nothing.<a name="line.68"></a>
<FONT color="green">069</FONT>       * @throws IOException some exception<a name="line.69"></a>
<FONT color="green">070</FONT>       * @throws ServletException another exception<a name="line.70"></a>
<FONT color="green">071</FONT>       */<a name="line.71"></a>
<FONT color="green">072</FONT>      public void doFilter(ServletRequest servletRequest, ServletResponse<a name="line.72"></a>
<FONT color="green">073</FONT>          servletResponse, FilterChain filterChain) throws IOException, ServletException {<a name="line.73"></a>
<FONT color="green">074</FONT>        HttpServletRequest request = (HttpServletRequest) servletRequest;<a name="line.74"></a>
<FONT color="green">075</FONT>        HttpServletResponse response = (HttpServletResponse) servletResponse;<a name="line.75"></a>
<FONT color="green">076</FONT>    <a name="line.76"></a>
<FONT color="green">077</FONT>        if (request.getSession().getAttribute("user") == null) {<a name="line.77"></a>
<FONT color="green">078</FONT>    <a name="line.78"></a>
<FONT color="green">079</FONT>          // if url is a allowable, then pass through<a name="line.79"></a>
<FONT color="green">080</FONT>          if (isPublicResource(request)) {<a name="line.80"></a>
<FONT color="green">081</FONT>            filterChain.doFilter(request, response);<a name="line.81"></a>
<FONT color="green">082</FONT>          }<a name="line.82"></a>
<FONT color="green">083</FONT>    <a name="line.83"></a>
<FONT color="green">084</FONT>          // if url is not allowable and user attribute not set, redirect to my login page.<a name="line.84"></a>
<FONT color="green">085</FONT>          else {<a name="line.85"></a>
<FONT color="green">086</FONT>            String targetUrl = URLEncoder.encode(request.getServletPath(), "UTF-8");<a name="line.86"></a>
<FONT color="green">087</FONT>            setErrorMessage("Please login to access the current page.");<a name="line.87"></a>
<FONT color="green">088</FONT>            response.sendRedirect(<a name="line.88"></a>
<FONT color="green">089</FONT>                    request.getContextPath() + "/index.jsp?targetUrl=" + targetUrl);<a name="line.89"></a>
<FONT color="green">090</FONT>          }<a name="line.90"></a>
<FONT color="green">091</FONT>        }<a name="line.91"></a>
<FONT color="green">092</FONT>    <a name="line.92"></a>
<FONT color="green">093</FONT>        // if user is set, then pass through url<a name="line.93"></a>
<FONT color="green">094</FONT>        else {<a name="line.94"></a>
<FONT color="green">095</FONT>          filterChain.doFilter(request, response);<a name="line.95"></a>
<FONT color="green">096</FONT>        }<a name="line.96"></a>
<FONT color="green">097</FONT>      }<a name="line.97"></a>
<FONT color="green">098</FONT>    <a name="line.98"></a>
<FONT color="green">099</FONT>    <a name="line.99"></a>
<FONT color="green">100</FONT>      /**<a name="line.100"></a>
<FONT color="green">101</FONT>       * Method that checks the request to see if it is for a publicly accessible resource.<a name="line.101"></a>
<FONT color="green">102</FONT>       * @param request a http request.<a name="line.102"></a>
<FONT color="green">103</FONT>       * @return all the good stuff.<a name="line.103"></a>
<FONT color="green">104</FONT>       */<a name="line.104"></a>
<FONT color="green">105</FONT>      protected boolean isPublicResource(HttpServletRequest request) {<a name="line.105"></a>
<FONT color="green">106</FONT>        return publicUrls.contains(request.getServletPath());<a name="line.106"></a>
<FONT color="green">107</FONT>      }<a name="line.107"></a>
<FONT color="green">108</FONT>    <a name="line.108"></a>
<FONT color="green">109</FONT>    <a name="line.109"></a>
<FONT color="green">110</FONT>      /** Does nothing. */<a name="line.110"></a>
<FONT color="green">111</FONT>      public void destroy() { <a name="line.111"></a>
<FONT color="green">112</FONT>        // does nothing<a name="line.112"></a>
<FONT color="green">113</FONT>      }<a name="line.113"></a>
<FONT color="green">114</FONT>    }<a name="line.114"></a>




























































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